RE: How high do I need to go?
Anything above twenty feet would be considered a fair height to be above there sense of smell but that doesn't always apply when your hunting along a ridge line.
Sometimes the wind currents will take your sent downward instead of across or away from your hunting area.
As for your pins I would leave them be as is ... if you have to shoot directly below your stand just remember to use your top pin and aim alittle lower than you would normaly do.